[size=150] 1. Key in the lengths of 3 line segments. e.g (3, 4, 5), (2, 3, 4), (5, 8, 17), (6, 9, 12), (5, 12, 13)[br] 2. Form a triangle using the three line segments. [br] 3. Check calculations of the square of the longest side and compare it with the sum of squares [br] of the remaining two sides. [br] 4. If they match, check using a virtual protractor that the triangle is right angled. [/size]